抗癌药物呋氟尿嘧啶的电化学控制释放

采用聚吡咯修饰铂电极对抗癌药物呋氟尿嘧啶进行电化学控制释放,结果表明该药物的负载与释放由聚吡咯膜的电化学氧化还原过程决定,其释放量可达１０^5mol/L,并与还原电量、膜厚呈线形关系。     

生物功能电极(Ⅳ)PP/GOD电极的电化学行为

利用电化学固定化方法制备聚毗咯/葡萄糖氧化酶膜电极(PP/GOD),并研究其电化学行为,在除氧的磷酸盐缓冲溶液中经不同极化处理后的PP/GOD电极在循环伏安图上表现出不同电流峰,归因于聚吡咯电极氧化态的转变,GOD的存在引起PP/GOD电极与聚吡咯电极伏安行为的差异,讨论了PP/GOD电极对葡萄糖的响应性能,指出聚吡咯的完全氧化态PP~(++)可能参与酶反应中的氧还原过程。     

聚吡咯膜电极对茜素红的电催化作用

用循环伏安法研究了电化学聚合的聚吡咯（ＰＰｙ）膜电极对茜素红电极反应的电催化活性。在聚吡咯膜电极上，茜素红的阳极氧化电流比在铂电极上增加数倍。相应的阴极过程也较铂电极显出一定的催化活性。茜素红在铂电极上和ＰＰｙ膜电极上都显示了吸附现象。在ＰＰｙ膜电极上用电位扫描法载入一定的铂微粒时，载铂微粒的ＰＰｙ膜电极上茜素红的电催化电流进一步增加．在较高的电位和扫描速率下更为明显；但载入的铂微粒过多时，则使电流峰变平坦。     

聚吡咯掺杂溴酚蓝修饰玻碳电极的制备和电化学性质

将玻碳电极在含吡咯、溴酚蓝(BPB)和KCl的磷酸盐缓冲溶液(PBS)中进行循环电位扫描,可在玻碳电极表面形成掺杂溴酚蓝的聚吡咯薄膜.制备的修饰电极在PBS中进行循环伏安扫描产生一对可逆性很好的氧化还原峰.电极具有良好的稳定性和电化学活性.对烟酰胺腺嘌呤二核苷酸(NADH)的氧化有催化作用.     

聚吡咯膜对抗坏血酸电催化氧化的作用

用循环伏安法,在酸性介质中对掺铁氰根聚吡咯电极膜催化抗坏血酸(AH2)氧化的电化学行为,阳极峰电流(iPa)与AH2的浓度关系进行研究.结果表明,该电极修饰膜可测定水果等多种样品中的抗坏血酸.     

影响聚吡咯铝电解电容器漏电流的因素及改进措施

利用电化学沉积的方法在腐蚀并赋能的铝箔试样表面合成了聚吡咯，并制备了聚吡咯铝电解电容器。在聚吡咯被覆的过程中，由于聚合溶液的毛细现象使电容器的阴极与阳极之间形成了微小的电气通路，另外聚合溶液对铝氧化膜有一定的腐蚀作用，导致氧化膜的缺陷增加，这两种情况是聚吡咯电解电容漏电流增加的根本原因。研究发现，采用合适的阻断材料和缩短聚合时间均可以有效地降低它们的影响。通过热重－差热分析，说明了在贮存过程中环境对这种电容器漏电流的影响，并提出了保持该电容器长期性能稳定的措施。     

多巴胺在过氧化聚吡咯膜修饰碳纤维微柱电极上的伏安行为(英文)

用电化学方法制备了过氧化聚吡咯膜修饰碳纤维微柱电极,并对其电化学行为进行了研究.结果表明,在中性和酸性缓冲溶液中,过氧化聚吡咯膜修饰微电极能有效地排除抗坏血酸的干扰而选择性地对多巴胺产生响应.     

电流型聚吡咯碘离子化学修饰电极的制备与性能研究

本文在玻碳电极（GCE）表面上修饰了一层导电聚合物──聚吡咯（PPy）薄膜,用循环伏安法制备了新型的基于电流响应的碘离子掺杂的聚吡略修饰电极;研究了电极的电化学特性。此修饰电极对碘离子的响应是基于碘离子在PPy膜与电解质溶液中的掺杂平衡以及PPy膜中的碘离子在修饰电极表面的氧化还原过程;制成的电流型电极对5．0×10-2～1．0×10－5mol／L的碘离子呈良好的线性响应关系,检测下限为6．0×10－6mol／L,具有线性范围广,性能稳定的特点。     

聚3-甲氧基噻吩对二巯基噻二唑的电化学改性的研究

研究了聚3-甲氧基噻吩(PMOT)膜电极在2,5-二巯基-1,3,4-噻二唑 (DMcT)溶液中电化学处理或浸泡后的循环伏安(CV)曲线的变化规律, 并研究了一定量的PMOT对DMcT充放电性能的影响。实验结果表明,PMOT膜电极在DMcT溶液中进行电化学处理或浸泡过程可使DMcT进入PMOT膜内部与PMOT形成复合物。PMOT对DMcT的电化学催化作用可能和二者之间形成的电子给体－受体复合物有关。该复合物的电化学氧化还原特性不同于PMOT和DMcT,其氧化还原反应速率和可逆性均优于DMcT, 且经过PMOT催化改性后, DMcT的放电容量得到了增加, 循环性能有了很大改善。     

聚3-甲氧基噻吩对二巯基噻二唑的电化学改性的研究

研究了聚3-甲氧基噻吩(PMOT)膜电极在2,5-二巯基-1,3,4-噻二唑(DMcT)溶液中电化学处理或浸泡后的循环伏安(CV)曲线的变化规律,并研究了一定量的PMOT对DMcT充放电性能的影响。实验结果表明,PMOT膜电极在DMcT溶液中进行电化学处理或浸泡过程可使DMcT进入PMOT膜内部与PMOT形成复合物。PMOT对DMcT的电化学催化作用可能和二者之间形成的电子给体-受体复合物有关.该复合物的电化学氧化还原特性不同于PMOT和DMcT,其氧化还原反应速率和可逆性均优于DMcT,且经过PMOT催化改性后,DMcT的放电容量得到了增加,循环性能有了很大改善。     

聚吡咯/海藻酸锰小球的性能研究

将海藻酸钠水溶液滴加到Mn Cl2水溶液中凝固成海藻酸锰小球。海藻酸锰小球吸附吡咯单体,在酸性KMn O4溶液中使吡咯单体氧化聚合成聚吡咯(PPy),得到聚吡咯/海藻酸锰复合小球(MPM)。用红外光谱仪、扫描电子显微镜和电化学工作站表征了复合小球的结构、形貌和电化学性能。结果表明:直径为200⁵00 nm的PPy微球聚集在海藻酸锰小球的表面。随着海藻酸钠在Mn Cl2水溶液的凝固时间增加,MPM的PPy含量偏低,复合小球的电容值减小。这种具有导电和生物相容性的MPM将在新型电极材料领域得到应用。     

铂、锡共修饰聚吡咯电极对甲醇的电催化氧化

采用电化学方法在铂基体上制备铂、锡共修饰聚吡咯修饰电极,以提高对有机小分子的电催化氧化.对其制备条件及电化学性质进行了讨论,并用于甲醇的电催化氧化,循环伏安及放电实验表明具有较好的电催化活性,比裸铂电极上的电流峰高近30倍.进而探讨了甲醇在该电极上的电催化氧化机理,认为电催化活性的提高是由于Sn在电极表面的吸附和在PPy膜中的嵌入,吸附活性氧,减少铂电极表面的中毒.     

PW12-MWCNT-PPY/GC修饰电极的制备及电化学性质研究

采用电聚合方法在玻碳电极上制备了Keggin型磷钨酸-多壁碳纳米管-聚吡咯(PW12-MWCNT-PPy)复合物膜修饰电极,并探讨了该电极对NO2-的电催化还原和电化学行为。实验结果表明,该电极对NO2-响应速度快,检测灵敏度高。NO2-在2.1μmol.L-1～1.3 mmol.L-1浓度范围内,与修饰电极上的稳态安培响应电流呈线性关系,检测限为0.62μmol.L-1(S/N=3).该修饰电极用于腌菜中亚硝酸根离子的测定,回收率在95%～99%之间。     

Effect of electrolytes on electrochemical properties of graphene sheet covered with polypyrrole thin layer

Graphene sheet (GS) was successfully covered with a polypyrrole (PPy) thin layer through in situ chemical oxidative polymerization of pyrrole monomers in aqueous solution by using GS as a support material and ferric trichloride as an oxidant. The resulting nanocomposite was studied by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and electrical measurements, including cyclic voltammetry (CV), galvanostatic charge/discharge experiment (GCD), and impedance spectroscopy (EIS). It has been found that the nanocomposite exhibited a typically curved and layer–like structure, and conformational change of PPy chains occurred due to the π–π stacking interaction between the graphitic structures in GS and aromatic rings of the PPy chains. More attention was paid to the effect of electrolytes on electrochemical properties of the nanocomposites, as expected, electrochemical performance was dependent on the nature of the electrolyte, and the neutral electrolytes containing alkali metal ions were found to be very suitable for GS/PPy nanocomposite. Compared with the pure PPy, the nanocomposite possessed larger specific capacitance and lower internal impedance, indicating that the nanocomposite can be a promising candidate as electrode material for supercapacitors.     

亚硝基聚吡咯修饰离子选择性电极的制备及电化学性能

用循环伏安法（CV）制备了聚吡咯亚硝酸根离子选择性电极。表征了电极的电化学性能。在1．0x10－1～5．0x10－5mol／L浓度范围内，电极电位与亚硝酸根离子浓度成良好的线性关系，Nernst响应科率为51mv／PNO2－。观察了NO2-在PPy膜中掺杂＝去掺杂过程，从而验证了电极响应是基于掺杂机理。     

Effect of feeding ratios on the structure and electrochemical performance of graphite oxide/polypyrrole nanocomposites

Graphite oxide (GO)/polypyrrole (PPy) nanocomposites (GPYs) were synthesized using in situ polymerization.The effect of the feeding ratios of pyrrole and GO on the structure and electrochemical performances of GPYs was investigated.The structure was characterized via Fourier-transform infrared spectroscopy,scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The electrochemical performance was characterized via cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy.The results indicate that the more pyrrole is added to GO (with GO concentrations of 20% and 50%),the more agglomeration of both PPy and GO layers occurs.This is detrimental to the capacitance utilization of PPy.When the feeding ratio of GO:pyrrole is 80:20,PPys with nanofibrils are dispersed homogenously in/on the exfoliated layer of GO and the conductivity is enhanced.The capacitance utilization of PPy in a composite with a GO concentration of 80% (383 F/g) is higher than that of pure PPy (201 F/g),which indicates the presence of a synergistic effect between GO and PPy.     

溶剂对导电聚吡咯防腐蚀性能的影响

采用循环伏安法分别在含吡咯+NaClO4的乙腈中和水中,在不锈钢表面制备了聚吡咯(PPy)膜.用扫描电子显微镜观察了PPy膜的表面形貌,用四探针法测量了PPy膜的电导率,用动电位极化曲线和电化学阻抗谱研究了在1mol/L H2SO4中PPy膜对不锈钢的防腐蚀性能.结果表明,在两种溶剂中制备的PPy膜都由球状粒子组成,但在水中制备的PPy膜结节较多.在乙腈中制备的PPy的电导率和对不锈钢的防护性能都显著高于在水中制备的PPy.由于乙腈的给电子性较水的小,与吡咯聚合中间体的作用小,链反应较难终止,使得PPy聚合链共轭度长,膜的缺陷少,电导率大,防腐性能好.     

Binder-free heterostructure(g-C_3N_4/PPy) based thin film on semi-flexible nickel foam via hybrid spray technique for energy storage application

A semi-flexible binder-free graphitic carbon nitride(g-C_3N_4) intercalated polypyrrole(PPy) nanocomposite thin film was prepared via hybrid electrospray technique. A homogeneous thin film was achieved by the controlled spray process. A deposited thin film illustrated the amorphous nature of composite with high surface purity and good chemical composition. The surface analysis confirmed the smoother surface with well-defined distinct phases of g-C_3N_4 and PPy matrix in the composite thin film. The electrochemical studies exhibited that a maximum areal capacity of the thin film was achieved to be 289.6 mF/cm~2 at a current density of 0.4 mA/cm~2,which is higher than that of pristine PPy(194.8 mF/cm~2). The heterostructure electrode illustrated that the life cycles of 99% could be up to 10,000 cycles with low resistance due to the synergetic effect of g-C_3N_4 and PPy matrix with strong material adhesion(hybrid spray process) on the surface. A binder-free heterostructure thin film will play a significant role in the energy storage application.